package com.atguigu.gulimall.product.service.impl;

import com.atguigu.gulimall.product.service.CategoryBrandRelationService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;
import org.springframework.transaction.annotation.Transactional;

@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Autowired
    CategoryBrandRelationService categoryBrandRelationService;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }
    /**
     * @Author:孙维
     * @Description:
     * @Date: 2021/9/5 21:42
     * @Param:[]
     * @return:java.util.List<com.atguigu.gulimall.product.entity.CategoryEntity>
     **/
    @Override
    public List<CategoryEntity> listwithtree() {
        //查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);
        //组装成父子的树形结构
        //查出所有的一级分类
        List<CategoryEntity> level1Menus = entities.stream().filter((CategoryEntity) -> {
            return CategoryEntity.getParentCid() == 0;
        }).map((menu)->{
            menu.setChildren(getChildrens(menu,entities));
            return menu;
        }).sorted((menu1,menu2)-> {
            return (menu1.getSort()==null?0:menu1.getSort())-(menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());

        return level1Menus;
    }

    @Override
    public void removeMenusByIds(List<Long> asList) {
        //TODO 1.检查当前删除的菜单,是否被别的地方引用
        baseMapper.deleteBatchIds(asList);
    }


    @Override
    public Long[] findCatelogPath(Long catelogId) {
        List<Long> paths = new ArrayList<>();
        List<Long> parentPaths = findParentPath(catelogId, paths);

        Collections.reverse(parentPaths);

        return parentPaths.toArray(new Long[parentPaths.size()]);
    }

    /**
     * @Author:孙维
     * @Description://级联更新所有关联数据
     * @Date: 2021/10/18 13:08
     * @Param:[category]
     * @return:void
     **/
    @Transactional
    @Override
    public void updateCascade(CategoryEntity category) {
        this.updateById(category);
        categoryBrandRelationService.updateCategory(category.getCatId(),category.getName());


    }

    /**
     * @Author:孙维
     * @Description://递归查找id及其所有父id
     * @Date: 2021/10/14 16:26
     * @Param:[catelogId, paths]
     * @return:java.util.List<java.lang.Long>
     **/
    private List<Long> findParentPath(Long catelogId,List<Long> paths){
        //1.收集当前节点ID
        paths.add(catelogId);
        CategoryEntity byId = this.getById(catelogId);
        if(byId.getParentCid()!=0){
            findParentPath(byId.getParentCid(),paths);
        }
        return paths;
    }

    private List<CategoryEntity> getChildrens(CategoryEntity root,List<CategoryEntity> all){

        List<CategoryEntity> children = all.stream().filter((categoryEntity) -> {
            return categoryEntity.getParentCid().equals(root.getCatId());
        }).map(categoryEntity -> {
            //1、找到子菜单
            categoryEntity.setChildren(getChildrens(categoryEntity,all));
            return categoryEntity;
        }).sorted((menu1, menu2) -> {
            return (menu1.getSort() == null ? 0 : menu1.getSort()) - (menu2.getSort() == null ? 0 : menu2.getSort());
        }).collect(Collectors.toList());
        return children;
    }

}